netdev - Re: [PATCH 6/6] sched: Change task

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Date:   Wed, 2 Jun 2021 16:10:11 +0100
From:   Will Deacon <will@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Jens Axboe <axboe@...nel.dk>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
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        Jason Wessel <jason.wessel@...driver.com>,
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Subject: Re: [PATCH 6/6] sched: Change task_struct::state

On Wed, Jun 02, 2021 at 03:12:31PM +0200, Peter Zijlstra wrote:
> Change the type and name of task_struct::state. Drop the volatile and
> shrink it to an 'unsigned int'. Rename it in order to find all uses
> such that we can use READ_ONCE/WRITE_ONCE as appropriate.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  block/blk-mq.c                 |    2 -
>  drivers/md/dm.c                |    6 ++--
>  fs/binfmt_elf.c                |    8 +++---
>  fs/userfaultfd.c               |    4 +--
>  include/linux/sched.h          |   31 +++++++++++------------
>  include/linux/sched/debug.h    |    2 -
>  include/linux/sched/signal.h   |    2 -
>  init/init_task.c               |    2 -
>  kernel/cgroup/cgroup-v1.c      |    2 -
>  kernel/debug/kdb/kdb_support.c |   18 +++++++------
>  kernel/fork.c                  |    4 +--
>  kernel/hung_task.c             |    2 -
>  kernel/kthread.c               |    4 +--
>  kernel/locking/mutex.c         |    6 ++--
>  kernel/locking/rtmutex.c       |    4 +--
>  kernel/locking/rwsem.c         |    2 -
>  kernel/ptrace.c                |   12 ++++-----
>  kernel/rcu/rcutorture.c        |    4 +--
>  kernel/rcu/tree_stall.h        |   12 ++++-----
>  kernel/sched/core.c            |   53 +++++++++++++++++++++--------------------
>  kernel/sched/deadline.c        |   10 +++----
>  kernel/sched/fair.c            |   11 +++++---
>  lib/syscall.c                  |    4 +--
>  net/core/dev.c                 |    2 -
>  24 files changed, 108 insertions(+), 99 deletions(-)

I think this makes the code a _lot_ easier to understand, so:

Acked-by: Will Deacon <will@...nel.org>

on the assumption that you'll fix get_wchan() for !x86 as well.

Cheers,

Will